Compound wire rope



G. PYBURN.

COMPOUND WIRE ROPE. APPLICATION FILED OCT; 11, I920.

Patented Sept. Q 19, 1922.

Patented Sept. 19, 1922.

STTES innate GEORGE PYBUBN, OF AIRDRIE, SCOTLAND.

COMPOUND WIRE ROPE.

Application filed October 11, 1920. Seria1 No. 416,100.

To all whom it may concern:

Be it known that I, GEORGE PYBURN, of Caledonia House, Cairnhill Road,Airdrie, Scotland, foreman wire-rope maker, have invented certain newand useful Improvements in and Connected with Compound WVire Ropes, ofwhich the following is a specification.

My invention relates to improvements in all classes of compound wireropes, and has for its object to construct these, either right or lefthand twist, in such a manner as to obtain the advantages of an improvedunkinkable dead Langs lay rope. At present Langs lay ropes contain alarge amount of life owing to the twist engendered in the rope duringits construction and this renders the rope very difficult to handle,makes it kink readily and thus prevents the rope giving the bestpossible results when working. The object of my invention is to get overor obviate these troubles while retaining the advantages a Langs layrope possesses over an ordinary lay rope, and give a much better wearingsurface, a longer life, and also be very much easier to handle thanropes presently in use. In addition, my method does not require anyspecial machinery.

According to my invention, I construct the rope of a number of strands,twisted round a hemp rope, wire or other core. each strand containing anumber of wires and each being constructed in the same manner orprinciple as the following example. The number of wires in each strandwill vary according to the size of the rope and the work it will requireto do, but the principle embodied in the invention and the number ofwires forming the core of the strand viz two, will always be the same.

In order that my invention may be properly understood and readilycarried into effeet I have hereunto appended one sheet of drawings ofone form of compound rope illustrating the invention of which- Figure 1is an elevationof a piece of compound wire rope illustrating mylnventlon.

Figure 2 is an end view.

Referring to the drawings, which illustrate for example strandcontaining 16 wires, the wires are built up in the machine or machines,at either one or more operations, commencing with the core, viz, twowires, A, B, which are covered by six wires C, D, E, F, G, H, and inturn these are covered by eight wires J, K, L, M, N, O, P. Q. The corereferred to viz, the two wires A, B, must be laid in the strand horizontally-parallel, and the size of the wire must be not less than halfthe size of one of the six wires i. e. if the size of one of the sixwires is .060, the size of the core wires must be .030. The length ofthe lay put on the eight wires in construction must be the same lengthas that put on the six wires. Then the length of the lay on the ropemust be twice the length of the lay on the strands, i. e. if the lay onthe eight and six wires referred to were l, then the lay on the ropewould be 8".

-When the strands are made up into the rope, the method of constructiondetailed above has the effect of imparting to the rope the advantageclaimed by me above.

Claim:

A compound wire rope strand compris ing two straight core wires arrangedin par allel relation, six wires covering the core wires, and of twicethe diameter of said core wires, said six wires being arranged in a layor twist, and a plurality of outer wires of greater diameter than saidsix wires and also arranged in a lay or twist, of the same length asthat of the said six wires, the length of the lay on the rope beingtwice that of the lay on the strands.

In testimony whereof I ailix my signature in presence of two witnesses.

GEORGE PYBUR-N.

Witnesses JOHN Lmnnn, JoI-IN TRAIN LIDDLE.

